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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb08921220d25eb0c8b93bf4c7fda8964262f37d49d4747e7a9f93da987ed9a8' 
  AND token = 'jIjTb49FQLH6cPZTNUoqtrnlLD96C+6mXF7s165BNoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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