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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d5d6983a34dbe58be0390fda440d3ce9c47efa91efd9219284535ed22c5a4dd' 
  AND token = 'DqRWlemcRDRSf6d0BQZ+RqrnPZMujEUMV4pOw0fWlXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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