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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '791cc341c61a9485d965842cf166f872512b510acb1922225aa52917faa4b13f' 
  AND token = 'BldnKQLG7JFEhbVqaO1Ky5amNl9XttNjMNIyHUleJko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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