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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c88fd8c7319ce8902ca3994964efbd5b7443888f604206e9b63b4ffeed41cae8' 
  AND token = 'GsV+cPpACEQ6Osem4IjZI0IleOU87w18a3FN3/R8xZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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