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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e5df2099b5765f49a743227b9955f0bc97e50c0384d8d4e8b568674b71ebaa6' 
  AND token = 'l5pGzFsH3ekqLxi8vLPwN9rNUTi7V0J7NL/kK6a9jeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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