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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '838a700c7e81bc3a3e04a4e509812ed8c4f6f88efaef4bff3026afe7bd2cfca1' 
  AND token = 'c4r7J06NceEL4D7E+e5GkaAPSW9/QNaA4w+XSj5Uivg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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