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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ba2067f77a06f810a231449ec618484a428d37b843e1933200bafb3df6507ae' 
  AND token = '3znSIs31EDqARQHRj+YQndPod967bfGbOHLDYLEDLX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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