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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c972c17c25ae501759174af296afe873e48be910e6fccfe07074b77a7c0a5056' 
  AND token = '7VTmLWLNd+Ggve1rUvpds7mN/TNFGFzUrJ+Dfs/4i+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}