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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe0ad01232a93254ae7c6c050d3dc4af622c52736c93ac5a1ffbf501b897ec42' 
  AND token = 'aJPlNNPwCQB0RfXPs3eDozWb0Dc89FnIdC3SMbPki2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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