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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34e7a854ca7e6c278d184a739e6d78adb9b760fb93da0e46cb1e4701709c12df' 
  AND token = 'OV1ghlL2+gO383piogXcw9vRrSPtB106fzcqK6JlMdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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