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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f56bffc006b4217658f612dfe6588de22312b9fc788438e088c6a183e1f3c82a' 
  AND token = 'Dnllpsn4OTi7cAq56WMfB75haGbxhdSbYBDS3u0aqdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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