SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9587e9607aa4134b1a2d7affaece86c95f740db6cf5ddcf1b1674f08a752f1a' 
  AND token = 'm4i66610o9ln0/gVGTGi/HBD/IYbp2VZXu+TXhKtGr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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