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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f2cb89ac228269123a393ca7e352c6a5984154098553e7730eb21128eda1fe0' 
  AND token = 'EfF7LeayLmiav4Kwcfp5QhZOoO7LMMFBdaVQ9FkGcs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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