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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e2a13cb8cd21d666ffa57fb5d77218d56fcaa535f70e7403a24b8f1c8e4a474' 
  AND token = 'Gr8cdCNniVJyt76ZrpGtm50xPelr/vTp1arGqfucadw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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