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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc5f3522fd7a9314a433326adc387834a530d0d20c956d441144860e1b12db37' 
  AND token = 'lihsetDAopTqfMFJrK3ZMy2WYrKI5uVZgHMg64Vkho0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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