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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48afe7326a096bf2ca31f6bb86700b2389656da7b0985b6600ceccdfe9e4c5dd' 
  AND token = 'tGfal8pZqG1WvdOsLmFgc3sQMi81pdZWYN1aFWYEi9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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