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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '100bf9bf29130bd0e77a47c172877b6656fe6bfef2410786fccfe52ad41f6c31' 
  AND token = 'hUcNkFsndQ6XtKQmjgQk4tQYoibiIH7F7ciYCspK2uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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