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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6eba29c7cabb49c70e7afa0b5ac421114a9be641f96eb7a09be27e94c76e0e1a' 
  AND token = 'fZULqB/1BVrJwb+hzvbhgYXP3CL12ss7WV1MS2UZ4c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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