SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43bae5e9ed91718569f2227b70be33ca7412883abb97f6f0ddabd5c4acf3b867' 
  AND token = 'Xp9qvwjel6O+WI4ZDVzlgNykxvu5jG9QIUqk6L7iy+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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