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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88ea73929ee980f97ad857614a2f09c74858b9b77f43e5af7cb372fccf4d990e' 
  AND token = 'Z85C+G3+N1fteq0uZukfnF0VYty+ldqsTK7DaEaQ114=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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