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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc18757bd4c6356c39267faec6b599e0fa2d8a21613e72e47ee5c4f9e7fc732c' 
  AND token = 'ApBXcP8Cehc6Xr5Aqf7sLSxZ1r8oWrgQ5bIEa3t7lgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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