SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb419053bed7e6589a00d3bae8dc57201997fb48c6e802737f51fc2268828a2c' 
  AND token = 'WLFHojkqvwcer9QzJSOOxejfFqL8FGbgmHR1UB35pfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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