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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11349bf64070be30f8eda08705871328888b443cb0708376bd9b04552f9e999a' 
  AND token = 'YKtuxDqKA4WUCUE4yd89Lrd/fXD14M+IL3/q53N4A9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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