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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '889686e746324bf35195fc68b2d8c0d2adf329ff0bf1db87d4a813f6e33a1544' 
  AND token = 'MS60llK1RExjcAo1f2m6BxiEZfyPCsxwYs2RF1nupTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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