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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ea8f906ec3848181da0d9276c3e42b40c5980a4f303ecce162ca94b2501c9c8' 
  AND token = '6XSFNjnIVK/A9yOVe/HxvBjDuEZOo3c8tIIMOsQuWkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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