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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a767404ef6ae7f5468d19e371796a40d26440efcf77fd0c9fbe6fa3055a4a642' 
  AND token = 'ptvs+9H3b45g6J9pUoAVP3xtKIfwNj0HpoK7kWPtWuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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