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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a1e874e6828be3ca331bc89438ae7c813b059283b7a8214713505b0a8cd2324' 
  AND token = 'dF5soJq1HNApYhoc7+9SUv0d2Mqb6cBK6xKaMKAqnDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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