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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31dcb5b320269a46d4e8fdb989ae0e97f8c29a493325dd532ff1009199f70d49' 
  AND token = 'Ydr4+u6k8j9gqCjyd0czokJ6x2PRsbjwg6SuqNOAgCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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