SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1375b787cef66723b31bf5b405567e8466bf1c2849f74c91eeb8e86421e63597' 
  AND token = 'lPppXEtaZ4MBDyMC8K/BwKXkPPy+Jkx8mm5ZXdsvT3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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