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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c03a141e9f34645cc0578980d10a7f1825f47b5751e84e37a90312d859aa6b0f' 
  AND token = 'Ijzs6tEgeolAAmG1Xgaruiw7s10PYQZ5NoEYWjxBnq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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