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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a3be57d41a61f1d2a5b954734de8c4efee639989a831e0d8b83bb4f145808f8' 
  AND token = 'XxP6ADe59PLx7NHSEwi4ov654DL7uLcavm+SQ2xuezo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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