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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0981566a3889bde601697d4f80a98a6818e3e8f6dd8234e04ad9165d02118686' 
  AND token = 'ZGI8lKo/K5q74qV7kbuFMJ0ajRCSkfdQCi0fGXGwaQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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