SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c165b47634c3c78f70089e51d64a557d99261a5ca991ba85f3f5d8f39a0e1c74' 
  AND token = 'rLghAY812J3sfiD+/8Aaswi3IzwDLux8gviJ7hZ7NR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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