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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6878ed1d51e4e9c414dba4efd956faa2641e6dc6090f90a906700e9c24ec6c99' 
  AND token = 'EHMBvrhN0oyecHX3mh+JQ6+4pUaHhGGQM44YMrDZQ9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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