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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0093f09e2b44d8653dba38beb96101f24d0c95aa47926ee41e4f1a9ab03a08d' 
  AND token = 'zoZxu+qj6oArZDFvtl8mtR57Hdf/KkRqpidyobOeN4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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