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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f051a148e68fbb8a95a16c267aa9cc7e3525cdcd8a17e889f5adc491b6e117bc' 
  AND token = 'Or6Ms1m3428ZhAGxnBX4A5GxrdeLWkWJ+zxH1YHmeD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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