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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db92106599f8429829b2799bb6cd5e2192f1700bf000c21e1fd15b1c2db0b3b7' 
  AND token = 'C8IVTvnBfgMI/XZ3UahO+16cfBOp6xmtgwykkg7tEUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00343

JSON explain

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