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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e6b0968be3c0c07ad2effee9d9740e7b3a8358d0df615e270c1dcafaba5ccab' 
  AND token = 'T7ncR3cDjNbOMVXmw2DrnT7SXlVSXXg1ko+XtWd1pq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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