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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9acc8f2bba7259db4c92fc6944a4dfe32a2e0d913bfe9cccd7d761b1348b4635' 
  AND token = 'L5maecOMVwIGI6cDvOWpD2Euk5LtD4weIp5eTLp7cPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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