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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0531af870a3550b62dccf4e3a500596b347350c4288adc5bcf5c166eebc24f54' 
  AND token = '5UlNdEM3GuzjnUekGyzhdm8gD6+xSaztwH5GZbRfPFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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