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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '727882b58af90f34cc2fcf4296314e62bad101d8363f24c97e82a4e221b4803d' 
  AND token = '70fl6oOjUSMvKHqAjcYtZ2a43LWvYhgDjGtjx3Hg0do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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