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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8ca1663060853433db3c6e6af6ed696155f5cfd160fa0ccc678b9ad7f29d9ac' 
  AND token = 'IXo02tdjjr8WrS3xSRWBO7Qe1P6D5AVwfUCTwxY3c4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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