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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c8d2b04192dddd5f8a23ed93b9b3b24544107862ad6dc01e1bfc14a6cbcebea' 
  AND token = 'YJhS2P7nskFffllaoVc7lQ1h+wQvxVwpCjlJt2C9xEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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