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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84f44b6eacf2712831a258ed8d0e39918b6dd3b452d6e6d93e9cfc00c636ddfc' 
  AND token = 'NNg12tUCH5PMI+CTYg9TrS+JuD0dPCxG27CEdymjmtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01094

JSON explain

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