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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2e4c5bf0a51dbca3acb61b87729bedaa71434a3e6c2ab932ba4dc8958340a1b' 
  AND token = 'EqLGdHZiUuylm03q71eOWJehP3cjT+JXPeZTBo9XCdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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